Wilmington City Hall Weather Records (USC00079600)

Record envelope, standing records and threshold days for Wilmington City Hall (USC00079600), Delaware, United States, with 65 years of record.

Key Facts for Wilmington City Hall

Wilmington City Hall (USC00079600) is a weather station in Delaware, United States at 39.75 latitude and -75.55 longitude, 31 m (102 ft) above sea level.
The station reports from 1894 to 1958, 65 years of record.
1,464 records set at Wilmington City Hall still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Wilmington City Hall set a daily record precipitation of 75.9 mm (3.0 in) on 22 October 1958.

About the Station

Location: Delaware, United States, 39.75 latitude, -75.55 longitude.
Elevation: 31 m (102 ft).
Period of record: 1894 to 1958, 65 years.
Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Wilmington City Hall. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Wilmington City Hall, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	19.4 C (66.9 F)	-18.3 C (-0.9 F)	n/a	n/a
Feb	25.6 C (78.1 F)	-23.3 C (-9.9 F)	n/a	n/a
Mar	26.7 C (80.1 F)	-12.8 C (9.0 F)	n/a	n/a
Apr	36.1 C (97.0 F)	-11.7 C (10.9 F)	n/a	n/a
May	36.7 C (98.1 F)	1.7 C (35.1 F)	n/a	n/a
Jun	38.9 C (102.0 F)	5.6 C (42.1 F)	n/a	n/a
Jul	38.9 C (102.0 F)	9.4 C (48.9 F)	n/a	n/a
Aug	41.7 C (107.1 F)	8.3 C (46.9 F)	n/a	n/a
Sep	37.2 C (99.0 F)	3.9 C (39.0 F)	n/a	n/a
Oct	32.2 C (90.0 F)	-3.9 C (25.0 F)	n/a	n/a
Nov	25.6 C (78.1 F)	-11.7 C (10.9 F)	n/a	n/a
Dec	18.9 C (66.0 F)	-21.7 C (-7.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Wilmington City Hall still stand. 1896 holds the most, with 146.

Standing records at Wilmington City Hall by the year they were set
Year set	Standing records
1894	82
1895	115
1896	146
1917	91
1918	96
1919	75
1920	76
1921	65
1922	63
1923	66
1924	65
1925	80
1926	77
1927	80
1928	72
1929	90
1930	67
1931	47
1937	9
1958	2

All-Time Record Progression

1 new records

1 all-time records were set at Wilmington City Hall between 27 June 1938 and 27 June 1938. Each dot is a new record.

Wettest Day of Each Month

Jun: 183.4 mm (7.2 in)

The wettest day on record for each calendar month at Wilmington City Hall. The most was 183.4 mm (7.2 in) on 27 June 1938.

Record daily precipitation for each month at Wilmington City Hall
Month	Record daily precipitation (mm)	Date
Jan	66.5 mm (2.6 in)	3 January 1936
Feb	70.9 mm (2.8 in)	20 February 1924
Mar	58.9 mm (2.3 in)	15 March 1912
Apr	65.3 mm (2.6 in)	18 April 1910
May	102.9 mm (4.1 in)	20 May 1894
Jun	183.4 mm (7.2 in)	27 June 1938
Jul	101.1 mm (4.0 in)	19 July 1919
Aug	127.8 mm (5.0 in)	1 August 1945
Sep	90.4 mm (3.6 in)	30 September 1924
Oct	76.2 mm (3.0 in)	9 October 1903
Nov	89.9 mm (3.5 in)	25 November 1950
Dec	90.2 mm (3.6 in)	30 December 1901

Period of Record Coverage

1894 to 1958

20 years of record at Wilmington City Hall, 1894 to 1958. 3 years have data for under 90 percent of days and are left out of rankings: 1894, 1937, 1958.

Days with data per year at Wilmington City Hall
Year	Days with data	Share of year	Complete
1894	273	75%	No
1895	331	91%	Yes
1896	351	96%	Yes
1917	356	98%	Yes
1918	365	100%	Yes
1919	364	100%	Yes
1920	366	100%	Yes
1921	365	100%	Yes
1922	365	100%	Yes
1923	365	100%	Yes
1924	364	99%	Yes
1925	363	99%	Yes
1926	363	99%	Yes
1927	362	99%	Yes
1928	364	99%	Yes
1929	365	100%	Yes
1930	364	100%	Yes
1931	365	100%	Yes
1937	31	8%	No
1958	16	4%	No

Latest Records

Latest records at Wilmington City Hall
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
22 October 1958	Wilmington City Hall, US	daily rain	75.9 mm (3.0 in)	23.3 mm (0.9 in)	1 year	21 of 100 (Routine)
25 August 1958	Wilmington City Hall, US	daily rain	78.7 mm (3.1 in)	31.2 mm (1.2 in)	47 years	37 of 100 (Notable)
25 July 1958	Wilmington City Hall, US	daily rain	33.5 mm (1.3 in)	0.5 mm (0.02 in)	20 years	12 of 100 (Routine)
26 June 1958	Wilmington City Hall, US	daily rain	43.7 mm (1.7 in)	5.6 mm (0.22 in)	56 years	26 of 100 (Routine)
6 April 1958	Wilmington City Hall, US	daily rain	52.6 mm (2.1 in)	16.0 mm (0.6 in)	19 years	25 of 100 (Routine)
17 September 1957	Wilmington City Hall, US	daily rain	24.1 mm (0.9 in)	2.8 mm (0.11 in)	12 years	10 of 100 (Routine)
2 April 1957	Wilmington City Hall, US	daily rain	25.4 mm (1.0 in)	1.5 mm (0.06 in)	36 years	18 of 100 (Routine)
13 December 1956	Wilmington City Hall, US	daily rain	25.4 mm (1.0 in)	2.3 mm (0.09 in)	39 years	18 of 100 (Routine)
1 November 1956	Wilmington City Hall, US	daily rain	76.2 mm (3.0 in)	24.1 mm (0.9 in)	5 years	24 of 100 (Routine)
22 October 1956	Wilmington City Hall, US	daily rain	52.6 mm (2.1 in)	34.6 mm (1.4 in)	27 years	37 of 100 (Notable)
21 July 1956	Wilmington City Hall, US	daily rain	76.2 mm (3.0 in)	21.6 mm (0.9 in)	44 years	32 of 100 (Routine)
14 March 1956	Wilmington City Hall, US	daily rain	41.9 mm (1.6 in)	20.1 mm (0.8 in)	2 years	24 of 100 (Routine)
18 February 1956	Wilmington City Hall, US	daily rain	25.4 mm (1.0 in)	10.2 mm (0.4 in)	28 years	22 of 100 (Routine)
11 November 1955	Wilmington City Hall, US	daily rain	10.2 mm (0.4 in)	1.3 mm (0.05 in)	36 years	16 of 100 (Routine)
8 October 1955	Wilmington City Hall, US	daily rain	24.6 mm (1.0 in)	9.1 mm (0.36 in)	28 years	20 of 100 (Routine)
9 June 1955	Wilmington City Hall, US	daily rain	50.8 mm (2.0 in)	25.4 mm (1.0 in)	20 years	30 of 100 (Routine)
30 May 1955	Wilmington City Hall, US	daily rain	22.6 mm (0.9 in)	8.6 mm (0.34 in)	8 years	15 of 100 (Routine)
21 March 1955	Wilmington City Hall, US	daily rain	38.1 mm (1.5 in)	6.3 mm (0.25 in)	53 years	27 of 100 (Routine)
11 September 1954	Wilmington City Hall, US	daily rain	27.4 mm (1.1 in)	8.9 mm (0.35 in)	54 years	27 of 100 (Routine)
23 April 1954	Wilmington City Hall, US	daily rain	35.1 mm (1.4 in)	7.4 mm (0.29 in)	32 years	21 of 100 (Routine)

Climate Trend

16 complete years, 1896 to 1931

One stripe for each of 16 complete years at Wilmington City Hall, 1896 to 1931. Blue stripes are years cooler than the station's own mean of 12.2 C (53.9 F); red stripes are warmer. The coolest year was 1917, at 10.7 C (51.3 F), and the warmest was 1896, at 13.4 C (56.2 F). The strongest colour marks a difference of 1.5 C (2.7 F).

Annual mean temperature at Wilmington City Hall as warming stripes, 1896 to 1931
Year	Annual mean temperature	Difference from the station mean
1896	13.4 C	+1.27 C
1917	10.7 C	-1.44 C
1918	12.1 C	-0.10 C
1919	12.4 C	+0.28 C
1920	11.4 C	-0.78 C
1921	13.3 C	+1.10 C
1922	12.5 C	+0.37 C
1923	12.2 C	+0.07 C
1924	11.2 C	-0.92 C
1925	12.4 C	+0.21 C
1926	11.0 C	-1.17 C
1927	11.9 C	-0.25 C
1928	12.0 C	-0.12 C
1929	12.2 C	+0.05 C
1930	12.7 C	+0.49 C
1931	13.1 C	+0.98 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1894 to 1958

Yearly extremes at Wilmington City Hall: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.7 C (107.1 F)	1918	36.1 C (97.0 F)	20
Coldest night (TNn)	-23.3 C (-9.9 F)	1918	-15.6 C (3.9 F)	20
Wettest day (Rx1day)	183.4 mm (7.2 in)	1938	66.0 mm (2.6 in)	65
Wettest five days (Rx5day)	261.7 mm (10.3 in)	1919	86.9 mm (3.4 in)	65
Longest dry spell (CDD)	34 days	1909	19 days	65

Hottest day (TXx)

The hottest day of the year at Wilmington City Hall, 1894 to 1958. The record is 41.7 C (107.1 F) in 1918, marked on the chart; the median year is 36.1 C (97.0 F).

Hottest day (TXx) at Wilmington City Hall by year
Year	Hottest day (TXx)
1894	38.9 C (102.0 F)
1895	38.3 C (100.9 F)
1896	39.4 C (102.9 F)
1897	n/a
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	37.2 C (99.0 F)
1918	41.7 C (107.1 F)
1919	36.1 C (97.0 F)
1920	32.8 C (91.0 F)
1921	34.4 C (93.9 F)
1922	33.9 C (93.0 F)
1923	36.1 C (97.0 F)
1924	34.4 C (93.9 F)
1925	37.2 C (99.0 F)
1926	35.6 C (96.1 F)
1927	33.9 C (93.0 F)
1928	37.2 C (99.0 F)
1929	33.9 C (93.0 F)
1930	38.9 C (102.0 F)
1931	36.1 C (97.0 F)
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	35.0 C (95.0 F)
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	27.2 C (81.0 F)

Coldest night (TNn)

The coldest night of the year at Wilmington City Hall, 1894 to 1958. The record is -23.3 C (-9.9 F) in 1918, marked on the chart; the median year is -15.6 C (3.9 F).

Coldest night (TNn) at Wilmington City Hall by year
Year	Coldest night (TNn)
1894	-13.9 C (7.0 F)
1895	-17.8 C (0.0 F)
1896	-17.2 C (1.0 F)
1897	n/a
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	-21.7 C (-7.1 F)
1918	-23.3 C (-9.9 F)
1919	-17.8 C (0.0 F)
1920	-17.2 C (1.0 F)
1921	-15.6 C (3.9 F)
1922	-17.2 C (1.0 F)
1923	-14.4 C (6.1 F)
1924	-15.6 C (3.9 F)
1925	-18.3 C (-0.9 F)
1926	-15.0 C (5.0 F)
1927	-16.7 C (1.9 F)
1928	-13.9 C (7.0 F)
1929	-14.4 C (6.1 F)
1930	-15.6 C (3.9 F)
1931	-11.1 C (12.0 F)
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	11.7 C (53.1 F)
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	4.4 C (39.9 F)

Wettest day (Rx1day)

The wettest day of the year at Wilmington City Hall, 1894 to 1958. The record is 183.4 mm (7.2 in) in 1938, marked on the chart; the median year is 66.0 mm (2.6 in).

Wettest day (Rx1day) at Wilmington City Hall by year
Year	Wettest day (Rx1day)
1894	102.9 mm (4.1 in)
1895	46.2 mm (1.8 in)
1896	67.8 mm (2.7 in)
1897	76.7 mm (3.0 in)
1898	50.8 mm (2.0 in)
1899	64.0 mm (2.5 in)
1900	55.9 mm (2.2 in)
1901	121.9 mm (4.8 in)
1902	66.0 mm (2.6 in)
1903	76.2 mm (3.0 in)
1904	88.4 mm (3.5 in)
1905	50.8 mm (2.0 in)
1906	63.0 mm (2.5 in)
1907	76.7 mm (3.0 in)
1908	61.0 mm (2.4 in)
1909	55.9 mm (2.2 in)
1910	74.9 mm (2.9 in)
1911	100.3 mm (3.9 in)
1912	63.2 mm (2.5 in)
1913	50.8 mm (2.0 in)
1914	59.4 mm (2.3 in)
1915	61.0 mm (2.4 in)
1916	45.2 mm (1.8 in)
1917	51.8 mm (2.0 in)
1918	40.9 mm (1.6 in)
1919	111.8 mm (4.4 in)
1920	71.1 mm (2.8 in)
1921	66.0 mm (2.6 in)
1922	58.7 mm (2.3 in)
1923	57.2 mm (2.3 in)
1924	90.4 mm (3.6 in)
1925	64.5 mm (2.5 in)
1926	68.6 mm (2.7 in)
1927	68.6 mm (2.7 in)
1928	83.8 mm (3.3 in)
1929	62.2 mm (2.4 in)
1930	66.0 mm (2.6 in)
1931	60.2 mm (2.4 in)
1932	68.6 mm (2.7 in)
1933	82.6 mm (3.3 in)
1934	70.1 mm (2.8 in)
1935	85.1 mm (3.4 in)
1936	66.5 mm (2.6 in)
1937	68.6 mm (2.7 in)
1938	183.4 mm (7.2 in)
1939	99.3 mm (3.9 in)
1940	52.1 mm (2.1 in)
1941	67.3 mm (2.6 in)
1942	78.7 mm (3.1 in)
1943	58.9 mm (2.3 in)
1944	67.1 mm (2.6 in)
1945	127.8 mm (5.0 in)
1946	61.2 mm (2.4 in)
1947	56.6 mm (2.2 in)
1948	51.6 mm (2.0 in)
1949	53.8 mm (2.1 in)
1950	89.9 mm (3.5 in)
1951	61.0 mm (2.4 in)
1952	46.5 mm (1.8 in)
1953	59.7 mm (2.4 in)
1954	56.4 mm (2.2 in)
1955	50.8 mm (2.0 in)
1956	76.2 mm (3.0 in)
1957	42.2 mm (1.7 in)
1958	78.7 mm (3.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Wilmington City Hall, 1894 to 1958. The record is 261.7 mm (10.3 in) in 1919, marked on the chart; the median year is 86.9 mm (3.4 in).

Wettest five days (Rx5day) at Wilmington City Hall by year
Year	Wettest five days (Rx5day)
1894	213.9 mm (8.4 in)
1895	59.7 mm (2.4 in)
1896	100.3 mm (3.9 in)
1897	107.7 mm (4.2 in)
1898	68.9 mm (2.7 in)
1899	64.0 mm (2.5 in)
1900	69.9 mm (2.8 in)
1901	126.5 mm (5.0 in)
1902	90.2 mm (3.6 in)
1903	99.3 mm (3.9 in)
1904	176.2 mm (6.9 in)
1905	68.4 mm (2.7 in)
1906	105.9 mm (4.2 in)
1907	103.1 mm (4.1 in)
1908	69.3 mm (2.7 in)
1909	65.2 mm (2.6 in)
1910	92.2 mm (3.6 in)
1911	181.3 mm (7.1 in)
1912	121.6 mm (4.8 in)
1913	84.6 mm (3.3 in)
1914	86.1 mm (3.4 in)
1915	114.8 mm (4.5 in)
1916	76.4 mm (3.0 in)
1917	78.5 mm (3.1 in)
1918	71.1 mm (2.8 in)
1919	261.7 mm (10.3 in)
1920	78.6 mm (3.1 in)
1921	72.9 mm (2.9 in)
1922	86.9 mm (3.4 in)
1923	70.4 mm (2.8 in)
1924	93.4 mm (3.7 in)
1925	84.8 mm (3.3 in)
1926	146.1 mm (5.8 in)
1927	79.0 mm (3.1 in)
1928	120.4 mm (4.7 in)
1929	112.6 mm (4.4 in)
1930	85.5 mm (3.4 in)
1931	71.9 mm (2.8 in)
1932	88.2 mm (3.5 in)
1933	189.1 mm (7.4 in)
1934	81.5 mm (3.2 in)
1935	184.2 mm (7.3 in)
1936	57.5 mm (2.3 in)
1937	83.4 mm (3.3 in)
1938	199.4 mm (7.9 in)
1939	99.3 mm (3.9 in)
1940	78.8 mm (3.1 in)
1941	66.4 mm (2.6 in)
1942	78.7 mm (3.1 in)
1943	89.7 mm (3.5 in)
1944	142.0 mm (5.6 in)
1945	166.7 mm (6.6 in)
1946	46.5 mm (1.8 in)
1947	95.5 mm (3.8 in)
1948	90.7 mm (3.6 in)
1949	74.1 mm (2.9 in)
1950	92.4 mm (3.6 in)
1951	94.8 mm (3.7 in)
1952	63.0 mm (2.5 in)
1953	94.0 mm (3.7 in)
1954	71.6 mm (2.8 in)
1955	83.6 mm (3.3 in)
1956	101.1 mm (4.0 in)
1957	73.9 mm (2.9 in)
1958	86.8 mm (3.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Wilmington City Hall, 1894 to 1958. The record is 34 days in 1909, marked on the chart; the median year is 19 days.

Longest dry spell (CDD) at Wilmington City Hall by year
Year	Longest dry spell (CDD)
1894	10 days
1895	19 days
1896	21 days
1897	26 days
1898	27 days
1899	21 days
1900	23 days
1901	29 days
1902	22 days
1903	20 days
1904	18 days
1905	29 days
1906	13 days
1907	15 days
1908	31 days
1909	34 days
1910	30 days
1911	17 days
1912	25 days
1913	16 days
1914	22 days
1915	26 days
1916	14 days
1917	22 days
1918	17 days
1919	11 days
1920	27 days
1921	16 days
1922	24 days
1923	25 days
1924	34 days
1925	23 days
1926	18 days
1927	17 days
1928	12 days
1929	16 days
1930	21 days
1931	21 days
1932	16 days
1933	14 days
1934	19 days
1935	21 days
1936	17 days
1937	10 days
1938	13 days
1939	25 days
1940	11 days
1941	28 days
1942	18 days
1943	24 days
1944	19 days
1945	12 days
1946	9 days
1947	17 days
1948	14 days
1949	20 days
1950	17 days
1951	13 days
1952	24 days
1953	19 days
1954	13 days
1955	27 days
1956	13 days
1957	26 days
1958	23 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

39 years, 1897 to 1957

A day with at least 62.5 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 175.3 mm (6.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Wilmington City Hall: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	62.5 mm (2.5 in)
5 years	80.9 mm (3.2 in)
10 years	96.7 mm (3.8 in)
25 years	122.3 mm (4.8 in)
50 years	146.3 mm (5.8 in)	Longer than the 39 years of record
100 years	175.3 mm (6.9 in)	Longer than the 39 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 39 years of values from 1897 to 1957.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 183.4 mm (7.2 in) in 1938; 127.8 mm (5.0 in) in 1945; 111.8 mm (4.4 in) in 1919.

Download the Data

Data for Wilmington City Hall standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Wilmington City Hall threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).